Method for regenerating positive electrode active material, regenerated positive electrode active material manufactured thereby, and secondary battery comprising same

EP4636905A4Pending Publication Date: 2026-06-03LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2024-07-31
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing methods for recycling positive electrode active materials from waste lithium secondary batteries are environmentally harmful, costly, and degrade battery performance due to the use of acids, solvents, and incomplete separation of components, leading to particle size distribution issues and potential explosions.

Method used

A method involving thermal decomposition of binders and conductive materials, followed by first and second milling, addition of a lithium precursor, and annealing, which prevents surface damage and uniformizes particle size without using acids or organic solvents, allowing for efficient recovery of the positive electrode active material.

Benefits of technology

The method achieves environmentally friendly recycling with reduced costs, prevents particle size increase, maintains battery characteristics, and avoids toxic gas generation, making it suitable for mass production.

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Abstract

The present invention relates to a method of recycling a positive electrode active material, a recycled positive electrode active material prepared using the method, and a secondary battery including the recycled positive electrode active material. More specifically, the method of the present invention includes a step of recovering a positive electrode active material in a positive electrode active material layer by thermally decomposing a binder and conductive material in the positive electrode active material layer by heat-treating a waste positive electrode having the positive electrode active material layer formed on a current collector; a step of performing first milling on the recovered positive electrode active material; a step of adding a lithium precursor to the first milled positive electrode active material and performing annealing at 400 to 1000 °C; and a step of performing second milling on the annealed positive electrode active material. According to the present invention, by performing first milling on a positive electrode active material recovered without a washing process after heat treatment of a waste positive electrode, adding a lithium precursor to the positive electrode active material subjected to the first milling, performing annealing, and then performing second milling, damage to the surface of the positive electrode active material may be prevented, the particle size of the recycled positive electrode active material may be uniform, and the increase in particle size may be minimized, thereby providing a recycled positive electrode active material having excellent battery characteristics.
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